Updated 13 April 2021
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A one-day event on the magnetisation of magnets in isolation and in assemblies such as motors, and the associated measurement of magnetic fields.
Magnetic technologies play an increasingly critical role in products of all kinds, from simple kitchen cabinet catches to the complex motors in electric cars and much more. Simply put, the modern world would not be possible without magnets. This seminar will look at magnetic components in manufacturing and the assembly process – when they come into the production line, how they need to be handled, when and how their magnetic fields are created, the impact of the field on the rest of the assembly process, how the field specification is confirmed, etc.
These subjects are critical to any company manufacturing products using any kind of magnet – incorrect magnet handling can lead to damaged products, increased costs, line shutdown, and significant HSE concerns, amongst other issues.
Speakers from industry and academia from the UK and Europe will highlight the state of the art in these capabilities.
- Jeremy Tompkins, Vacuumschmelze GmbH & Co KG
- Graeme Finch, NPL
- Philip Keller, Metrolab
The programme will consist of talks with Q&A, exhibitors, and networking sessions.
Approximate Start Time: 13:00
Approximate End Time: 18:00
All times GMT
The seminar will be hosted on hopin because it offers an intuitive online conference experience. As well as the talks on the Stage, at any time you can
- visit and talk with exhibitors in the Expo,
- set up small Sessions to talk together,
- search for and Invite delegates you want to speak to through the People list,
- Chat to the whole event, a session or an exhibitor’s booth,
- Ask questions of speakers and the whole event via Chat,
- examine the event Schedule in Reception for any changes,
- try the random delegate connection of Networking (an online version of standing in the queue for coffee and talking to the person behind you).
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Hirst's Pulse Field Magnetometry and Open to Closed Measurement Technologies
by John Dudding, Robin Cornelius, & James Clewett of Hirst Magnetics
Hirst’s history of practical, innovative magnetising and material parameter testing techniques is coupled to its long term aim of reinterpreting the open magnetic circuit measurements of magnet materials. Hirst’s 25 year development of Pulse Field Magnetometry (PFMs) led to the writing of IEC Technical Report TR62331 and is currently leading the international team working on the new International Standard IEC 60404 part 18 detailing the PFM technique.
Hirst has overcome many of the perceived limitations of the PFM technique but the ultimate goal has always been to use the PFM technique to provide accurate, repeatable and fast Permeameter, (BH Tracer,) closed circuit like results for engineering and quality control.
As well as a brief overview of its magnetising technologies which have also made progress, Hirst will describe the workings of PFMs, the limitations of the Permeameters and also its new PFM process*, enabling Open to Closed (O2C**) measurements of rare earth permanent magnet material and finished magnets in industrial shapes. This process enables, fast, repeatable measurements, between +210 °C and -40 °C with an accuracy currently under a confirmation review in an active joint project with the National Physical Laboratory (NPL)
Open to Closed measurement is expected to open a new era in the magnetic measurement of magnetic materials at a time when efficiency is powering our Green Technology revolution. Shaped pre magnetised components will at last have a pre-assembly and pre magnetisation QA capability.
*Patent applied for.
** Registered Trade Mark
A Geometry-Independent Moment Correction Method for the MPMS3 SQUID-Based Magnetometer
by Randy Dumas of Quantum Design, Inc.
The modern superconducting quantum interference device (SQUID) magnetometer is incredibly sensitive, with the ability to resolve magnetic moments ~1E-8 emu. More specifically, the MPMS3 SQUID-based magnetometer from Quantum Design utilizes two complimentary techniques to measure the DC magnetic moment of a sample. The DC-scan mode uses a traditional linear extraction technique, whereas the SQUID-VSM mode oscillates the sample with a small amplitude, both within a 2nd order gradiometer. While the ultimate measurement sensitivity is determined primarily by the SQUID detection circuitry, the measurement accuracy is strongly affected by the size, shape, and centering of the sample. If the experimental sample differs in size and/or shape from the calibration sample additional scale factors need to be applied to improve measurement accuracy. Most significantly, a radial offset of the sample within the gradiometer not only adversely affects the accuracy most, but is also difficult to measure and therefore account for in the calculation of any post-measurement corrective scale factors. In this talk I will show that the measured moments extracted from the DC-scan and SQUID-VSM modes are not only related to one another, but that this relation is surprisingly independent of sample size, shape, and radial offset. By exploiting this trend, a geometry-independent correction factor can be calculated by simply measuring a sample, which may have an arbitrary shape, size, and radial offset, using both DC-scan and SQUID-VSM modes, thus greatly improving measurement accuracy utilizing a simple post-processing algorithm.
The Role of Steel Cores in the Magnetisation Field Requirement for In-Situ Magnetisation of Permanent Magnets
by TBC of Laboratorio Elettrofisico
What magnetisation field is required for full saturation of a permanent magnet assembly inside a rotor? Thanks to the component's magnetic core effect, recommendations in the PM producer's data sheets are way beyond what's required for in-situ magnetisation, where 1500 kA/m may be sufficient despite the data sheets stating 2400 kA/m would be necessary. Laboratorio Elettrofisico will explain how this is possible, and how they model PM in simulations of the first magnetisation stage in industrial processes.